Alternating-current system.



L. FLEISCHMANN.

ALTERNATING CURRENT SYSTEM.

APPLICATION FILED APR. 29. 1913.

1 173,657, Patented Feb. 29, 1916.

Witnesses Inventbr:

Lionel F'leischmann,

H HisJ tt r-rwe I To all whom it may concern: g

Be it known that I, LIoNnn FLEIQCKMANN, at-citizen of the Unitedgstatesr-residing at. Berlin, Germany, have invented certain new .and' useful Improvements in Alternating-1 f Current Systems, of which the follow ng is a specificatiomj r My inventlon relatesftoalternating current systems, and in particular tots stems in which a tuningdevice is employe .for' ada j usting the impedance of the electric circuit.

More specifically, my invention, relates 'to .7

vice,

UNITED STATES PATENT; OFFICE.

LIONEL rnnrscnmnn, or'nnnnriyemanr, nssxenon 'ro GENERAL COMPANY, 1A conromrron or NEW Yome high frequency, alternating current systems resonance for this varied frequenc an in which it is desirable to maintain the epictric circuit tuned for resonance, or themo pedance of the circuit substantially con:

stant..

tems it is frequently desirable,

resonance in'order to obtain a satisfactory and efiicient output-of the alternating cur-- rent generatorsupplying'currentto the c1rcuit. If the speed of the generator varies, the frequency of the alternating current similarly varies, and if the tuning device remains unaltered the circuit is no lon er in 'sequently the effective output 0 the gem erator is diminished. I I

. The object of my invention is toprovide means for automatically adjusting an electrical constant, or constants, of an electric circuit. in response to changes in speed 0 the generator supplyingcurrent to thecirtion is to automatically adjust a tuningde vice. operatively related to an electric circuit, so that an electrical constant, or. con-'- are definitely" indicated in the claims .ap-'

pended hereto. v p

The details of constructlon and mode of operation of one embodiment of my'invention will be understood by reference tofthe '5 is operatively secured to the movable end of the speed-responsive".device and is ar- I v ranged to slide longitudinally on the shaft 3. In high frequency alternating current sysv and 1 oftennecessary, "to tune the electric circuit for- More particularly the object of my :inir'enbelieve to be ifollowing talren', m" connection J i'specm fitlon ottletters PatentL' -Q 1 i atented Feb, 29, 1916. amascarpe -2 ,1913.; seriQJ IaQWQass. i v

with the accompanying drawing, 1m which Y h figure 1s a diagrammatic view of the "novel. features of my inventionembodied in 'anialternatlng current system.

"In the drawing Ih'ave illustrated "an al jternatmg'current generator l'su plying cur- I rent to anfel ectric circuit.2. nthe rotor shaft 30f the generator is arranged a'speed- '1 'esponsive"devlce 4; In thedrawing, I have shown, for the purpose of] illustration, a centnfuglal-governor'as theis'peedsresponsive deut it will be understood' that any other equivalentdevice may be employed. A cam One terminal ofthe generator is connected to one of the line conductors .of the elec other terminal o the generator is .connectedthrough a tuning device to the other line i conductor," The tuning device shown in the drawing comprises a condenser 7 whose capacity is arranged to be adjustedby a movement of the arm 8, and an adjustable inductance-9 having-a coo eratingarm '10 for.

varying the amount 0 inductance included in the circuit. The arms 8 and 10 .are'pivoted to a connecting 'rod' 11.1'The connectnal movement of the cam along the shaft?! in rod'is pivoted to one arm -12"0f.alever," fu crumed at a fixed point 13.. -:The other, arm 14 of the lever operatively engages with f the surface of the cam5 so that a longitudi-. i

- turns the lever about its fulcrum and actu- --ates the connecting rod, jthereby movingthe arms 8 and -10,' and thus adjusting the If thespeed of. the rotor of the generator the speed-responsive device. Such a move-' amounts of inductancefand capacity operae tively related to the electric circuit. The operation of my novel system will I be obvious from the foregoing description:

ment of the'cam will produce a correspond- V ment of the tuning device, it is necessary to m and. predetermined movement of the" I arms '8 and 10, and thus the tuning-"device neratorm Since ingeneral I determine the degree of regulation desired for a definite varlation of speed. Any desired regulation can be given to the tuning device for a definite variation in speed by properly shaping the cam. The regulation I or adjustment the tuning device can thus be effected as any desired function of the 7 speed of the generator,

I have illustrated in the drawing one embodiment of my invention in which the capacity of the condenser and the inductance 1 are both decreased as the speed increases.

' employed the expression tuning, device to It beunderstood that this, relation be tween the speed of the generator and the adjustment of. the tuning device is merely for the purpose. of illustration, and I do not desire to limit my invention to this particular relation, but I aim in the apevident'to-tho'seskilled in the art that under A certain circumstances it may be unnecessary to employ both capacity and inductance in the tuning device, and I have accordingly inductance, or. both.

What I claim as new and deslre to secure cover a device having only capacity,'or only by Letters Patent of the United States, is,-. .1. The combination with a high frequency alternating current generator adapted to be driven at substantially constant speed, of a adjustable electric circuit tuning resonant electric circuit operatively related thereto, compensating means including an ,mentality for varying a suitable'electrical driven at substaptia resonant electrlc circuit assoclated thereinstruconstant of said circuit, and means responsive to the speed of said generator for automatically adjusting said compensating means to maintain said circuit in resonance regardless of any variations in the frequency of the alternating current supplied to the circuit by said generator resulting from fluctuations in the speed of the generator. g r I 2. The combination with a high frequency alternating current generator adapted to be ly constant speed, of a with, adjustable inductance and adjustable capacity electrically associated with said circuit, and means responsive to the speed of said generator for automatically adjusting said inductance and said capacity to maintain'said circuit in resonance regardless of any variations in the frequency of the alternating current supplied to the circuit by said generator resulting from fluctuations in the speed of the generator.

3. The combination with a high frequency alternating current generator adapted to be driven at substantially constant speed, of a resonant electric circuit associated therewith, compensating means including an adjustable electric circuit tuning instrumentality electrically associated with said circuit, and means for automatically adjusting said'compensating means to maintain said circuit in resonance regardless of any variations in the frequency of the alternating current supplied to the circuit by said generator resulting from fluctuations in the speed of the generaton In witness whereof, I have hereunto set my hand this 9th .day of April, 1913." q

LIONEL FLEISOHMANN. Witnesses:

RICHARD NEUMANN, GUSTAV WERNER. 

